org.apache.oro.text
public abstract class GenericPatternCache extends Object implements PatternCache
Since: 1.0
Version: 2.0.8
See Also: PatternCache PatternCacheLRU PatternCacheFIFO PatternCacheFIFO2 PatternCacheRandom
Field Summary | |
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static int | DEFAULT_CAPACITY
The default capacity to be used by the GenericPatternCache subclasses
provided with this package. |
Method Summary | |
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Pattern | addPattern(String expression, int options)
Adds a pattern to the cache and returns the compiled pattern. |
Pattern | addPattern(String expression)
Same as calling
addPattern(expression, 0); |
int | capacity()
Returns the maximum number of patterns that can be cached at one time.
|
Pattern | getPattern(String expression, int options)
This method fetches a pattern from the cache. |
Pattern | getPattern(String expression)
Same as calling
getPattern(expression, 0) |
int | size()
Returns the number of elements in the cache, not to be confused with
the capacity which returns the number
of elements that can be held in the cache at one time.
|
getPattern()
except for the fact that
it throws a MalformedPatternException if an expression cannot be
compiled.
addPattern() is meant to be used when you expressly intend to add an expression to the cache and is useful for front-loading a cache with expressions before use. If the expression added does not already exist in the cache, it is compiled, added to the cache, and returned. If the compiled expression is already in the cache, it is simply returned.
The expected behavior of this method should be to start replacing patterns in the cache only after the cache has been filled to capacity.
Parameters: expression The regular expression to add to the cache. options The compilation options to use when compiling the expression.
Returns: The Pattern corresponding to the String representation of the regular expression.
Throws: MalformedPatternException If there is an error in compiling the regular expression.
addPattern(expression, 0);
Throws: MalformedPatternException If there is an error in compiling the regular expression.
Returns: The maximum number of patterns that can be cached at one time.
addPattern()
except that it doesn't
throw a MalformedPatternException. If the pattern is not in the
cache, it is compiled, placed in the cache, and returned. If
the pattern cannot be compiled successfully, it
throws a MalformedCachePatternException.
Note that this exception is derived from RuntimeException, which means
you are NOT forced to catch it by the compiler. Please refer to
MalformedCachePatternException for a discussion of
when you should and shouldn't catch this exception.
Parameters: expression The regular expression to fetch from the cache in compiled form. options The compilation options to use when compiling the expression.
Returns: The Pattern corresponding to the String representation of the regular expression.
Throws: MalformedCachePatternException If there is an error in compiling the regular expression.
getPattern(expression, 0)
Returns: The current size of the cache (i.e., the number of elements currently cached).